论文部分内容阅读
通过反应挤出法一步实现均聚型聚丙烯的硅烷接枝和交联,制备出具有部分交联结构的高熔体强度聚丙烯。通过熔体强度、熔体黏度测试和熔体流动速率(MFR)、凝胶含量的变化研究了试剂体系对接枝交联改性的作用。结果显示,改性PP的MFR可降低至0.5g/10m in以下,熔体强度提高4.1倍,熔体剪切黏度提高1.707倍;加入的助剂体系中的各个组分都是有效和必要的,而且体系各个组分之间有相互协同作用;改性配方中各个组分的用量比显著影响改性PP的熔体流动速率和凝胶含量,当引发剂、接枝单体、接枝助剂的用量比为(0.36~0.54)∶1∶0.38时,可以获得最佳的改性效果。
The grafting and cross-linking of the homopolymer polypropylene silanes were carried out in one step by the reactive extrusion method to prepare high melt strength polypropylene with a partially crosslinked structure. The effect of reagent system on the graft modification was studied by the change of melt strength, melt viscosity, melt flow rate (MFR) and gel content. The results showed that the MFR of the modified PP could be reduced to less than 0.5g / 10m in, the melt strength increased 4.1 times and the melt shear viscosity increased 1.707 times. The components of the additive system added were both effective and necessary , And the synergistic effect between the various components of the system; the amount of each component of the modified formula significantly affect the modified PP melt flow rate and gel content, when the initiator, grafting monomer, grafting When the ratio of agent to dosage is (0.36 ~ 0.54): 1: 0.38, the best modification effect can be obtained.